Evolution Data Server would sometimes display email content as encrypted when it was not.
Marcus Brinkmann discovered that Evolution Data Server did not correctly interpret the output from GPG when decrypting encrypted messages. Under certain circumstances, this could result in displaying clear-text portions of encrypted messages as though they were encrypted.
30 May 2019
A security issue affects these releases of Ubuntu and its derivatives:
Evolution Data Server would sometimes display email content as encrypted when it was not.
Marcus Brinkmann discovered that Evolution Data Server did not correctly interpret the output from GPG when decrypting encrypted messages. Under certain circumstances, this could result in displaying clear-text portions of encrypted messages as though they were encrypted.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Evolution to make all the necessary changes.